Shelf assembly



FIG. 1 is a perspective view of a shelf assembly showing my new design;

FIG. 2 is a front elevational view of the shelf assembly of FIG. 1, the rear elevational view being identical thereto;

FIG. 3 is a left end elevational view of the shelf assembly of FIG. 1, the right end elevational view being identical thereto; and,

FIG. 4 is an enlarged scale top plan view of the shelf assembly of FIG. 1.

The surface(s) or portion(s) of the article not shown in the drawing or described in the specification form(s) no part of the claimed design. 

The ornamental design for a shelf assembly, as shown and described. 